1977193845019 has 8 divisors (see below), whose sum is σ = 2030684023728. Its totient is φ = 1923706429920.

The previous prime is 1977193844999. The next prime is 1977193845061. The reversal of 1977193845019 is 9105483917791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1977193845019 - 2¹⁷ = 1977193713947 is a prime.

It is a super-2 number, since 2×1977193845019² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977193845079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 802404 + ... + 2144350.

It is an arithmetic number, because the mean of its divisors is an integer number (253835502966).

Almost surely, 2^{1977193845019} is an apocalyptic number.

1977193845019 is a deficient number, since it is larger than the sum of its proper divisors (53490178709).

1977193845019 is a wasteful number, since it uses less digits than its factorization.

1977193845019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381805.

The product of its (nonzero) digits is 17146080, while the sum is 64.

The spelling of 1977193845019 in words is "one trillion, nine hundred seventy-seven billion, one hundred ninety-three million, eight hundred forty-five thousand, nineteen".